EP 3461116 A1 20190327 - A METHOD AND SYSTEM FOR AM SCREENING AND PROTECTING PRINTOUTS
Title (en)
A METHOD AND SYSTEM FOR AM SCREENING AND PROTECTING PRINTOUTS
Title (de)
VERFAHREN UND SYSTEM FÜR AM-SCREENING UND -SCHUTZ VON DRUCKAUSGABEN
Title (fr)
PROCÉDÉ ET SYSTÈME POUR CRIBLAGE AM ET PROTECTION D'IMPRIMÉS
Publication
Application
Priority
EP 17461612 A 20170923
Abstract (en)
A computer-implemented method for generating an amplitude modulated multi-cluster halftone dot for use in an amplitude modulated screen, the method comprising the steps of: determining (302) an arrangement of clusters within the dot; determining (303) a cluster function for each cluster, the cluster function defining a pixel sequence indicating a sequence of turning on of device pixels within an area of a particular cluster; determining (304) a dot function for the dot, the dot function defining a cluster sequence indicating a sequence of the clusters; and generating a set of data representative of the dot for a particular tonal value, by determining the device pixels within the dot turned on for that particular tonal value according to the cluster functions and the dot function.
IPC 8 full level
H04N 1/405 (2006.01)
CPC (source: CN EP US)
G03G 15/556 (2013.01 - US); H04N 1/00485 (2013.01 - CN); H04N 1/40043 (2013.01 - US); H04N 1/405 (2013.01 - CN); H04N 1/4051 (2013.01 - US); H04N 1/4055 (2013.01 - EP US)
Citation (applicant)
CRAIG C. COOK: "Color Digital Halftoning Using Multi-Cluster Halftone Dots", 1991, CAMBRIDGE UNIVERSITY PRESS
Citation (search report)
- [XY] US 8576449 B2 20131105 - BERNAL EDGAR A [US], et al
- [Y] US 8441688 B2 20130514 - KAWAMURA NAOTO [JP]
- [Y] US 2009034008 A1 20090205 - CROFT LAWRENCE [CA], et al
- [Y] WO 2013119235 A1 20130815 - HEWLETT PACKARD DEVELOPMENT CO [US], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3461116 A1 20190327; EP 3461116 B1 20240417; CN 109561232 A 20190402; CN 109561232 B 20201215; PL 233022 B1 20190830; PL 233023 B1 20190830; PL 240281 B1 20220314; PL 423637 A1 20190325; PL 423638 A1 20190325; PL 423639 A1 20190325; US 10778868 B2 20200915; US 2019098173 A1 20190328
DOCDB simple family (application)
EP 17461612 A 20170923; CN 201811119362 A 20180925; PL 42363717 A 20171129; PL 42363817 A 20171129; PL 42363917 A 20171129; US 201816139230 A 20180924